Yarn tensioning device



Sept. 29, 1931. w. BOCK unn wnusroume DEVICE Filed March 30, 1928 WITNESSES INVENTOR: Wzliwlm Bar/7:, F BY ATTORNEYS.

Patented Sept. 29 11 931 UNITED STATES PATENT orrlcs mnnnm noon, or nnnsnann. rnnnsnvmm, ASSIGNOR '10 DEZDALE nosrnnv' runs, or msnann, PENNSYLVANIA, A conronArIoN or PENNSYLVANIA irannrmsmme nEvIon Application 111 a larch so, 1928. Serial No. 265,849.

This invention relates to tensioning devices useful in connection with textile machinery such as yarnwinding, knitting, sewing machines, etc. 1

lhe objectof my invention is to provide a very simple and inexpensive device for the purpose indicated, capable of easy adjustment to increase or decrease the tension or drag induced in the yarn; of steadfastly s maintaining the desired tension after ad ustment; and of automatically adapting itself to variations in the speed of the yarn without faltering its allotted function of maintaining the required tension.

How the foregoing, as well as other advantages, may be readily realized in practice will be apparent from the detailed descri tion which follows of the typical embodiments of this invention shown in the drawao ings; whereof Fig. I is a perspective View of my yarn tensioning device in one form.

Fig. IE is a plan view of the same.

Fig. HE .is an end elevation as viewed iromthe left of Figs. 1 and ll; and,

Fig. is a side elevation as viewed from the bottom of Figs. 1 and Referring first to Figs. l IV oi the illustrations, it will be observed that the embodiment there shown comprises a member 10 3a which has the shape of a horseshoe in plan, i. e. with side extremities 11, 11, connected at one end by a cross bar 12 and separated by a longitudinal interval or opening 13. The member 10 is furthermore ierced as at 14, 14

to fixed parts of machinery with which the tensioning device is to be used. This opening 13 is occupied by an elongated weighted tensioning member 15, which is preferably made of porcelain or the like, affording a hard smooth outer surface for contact with yarn Y, and is fashioned to the configuration of a spool having'end flanges 16. The tensioning member 15 is carried by an arm 17 which extends axially through it and whereto it is secured by a nut 18 engaging the screw threaded ortion at 19. The opposite end of the arm I? a pair of ears 21 upstanding from the cross bar 12 of member 10 in line with its opening for passage of screws in e ecting attachment is flattened as at 20 to fit betweenwithin the clearance opening 13 provided for 5;

it in the fixed member 10, while wfloatingly sustained by the yarn Y passing transversely of the device, as vshown in Figs. l-Ill. in order that diiierent tension may be selectively imposed and maintained on the yarn l, the to side extremities 11 of the fixed member 10 are serrated with provision of a multiplicity of transversely-aligned guide grooves 23. By electingbe'tween the grooves 23 the tension or drag induced in the yarn l by the weight 61-; member 15 may be increased or decreased as I desired or required, the restraint imposed being obviously at the maximum when the two grooves 23 nearest the pivot 22 are used, and

at the minimum degree with employment of re the pair of grooves 23 remote from said pivot. {is an aid to obtain compensative graduation in the tension, the extremities 11 of the fixed member 10 are tapered in width, as manifested in Fig. III, so that the grooves 23 become shorter in length as the distance from the pivot 22 increases with consequent impartar tion of correspondingly less frictional restraint to passage'of the yarn Y. During operation of the device, the tensioning memso ber 15, by virtue of the freedom accorded it,

rides easily on the yarn Y and, moreover,

positionally adapts itself readily to suit changes in the speed of the latter.

Having thus described my invention, I claim:

1. A yarn tensioning devise embodying an elongated weighted tensioning member adapted to be floatingly sustained by the yarn,

and a fixed member having a central longiso tudinal clearance slot-and aflording the tensioning member free pivotal support at one end for movement up and down within said slot, said fixed member also having Serra-1 tions along each side of the slot providing a series of transverse grooves for selective guidance of the yarn crosswise of the tension member at different distances from its pivot to vany the drag induced. i v 2. yarn tensioning device embodying an elongated Wei hted tensioning membep "yarn, and a fixed mem ada to be oatin 1y pmd ber affording the tensioning member pivotal support at one end, said fixed member having tapering extremities extending along 0 posite sides of the tensioning .member wit serrations afiordin transversely-aligned ooves for guidance 0 the yarn crosswise o the device at difierent distances from the re ion of pivotal support, whereby, through se ection as between the guide grooves, the efieotiveness of said wei hted member as well as the frictional restraint imposed on the yarn may be compensatively varied to effect changes in tension.

In testimony whereof, I have hereunto signed my name at Lansdale, Pennsylvania, this 13th day of March, 1928.

WILHELM BOCK.

mamas sustained by the Y 

